staging: line6: wrap comment to 80 chars in driver.c

Fix the following checkpatch.pl warning:

  WARNING: line over 80 characters
  #1107: FILE: staging/line6/driver.c:523:
  +       /* Wait for data length. We'll get a couple of 0xff until length arrives. */
Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/line6/driver.c

@@ -520,7 +520,7 @@ int line6_read_data(struct usb_line6 *line6, int address, void *data,
 		return ret;
 	}
 
-	/* Wait for data length. We'll get a couple of 0xff until length arrives. */
+	/* Wait for data length. We'll get 0xff until length arrives. */
 	do {
 		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
 				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |